Floor-scraper.



J. F. BRADBURY.

FLOOR SGRAPER.

APPLICATION FILED APR. 6, 1907.

Patented Nov. 17, 1908.

WITNIESSES:

JOHN F. BRADBURY, OF DETROIT/MICHIGAN.

FLOOR-SCRAPEB.

Specification of Letters latent.

Application filed April 6, 1907.

Patented Nov. 17, 1908.

Serial No. 366,673.

To all whom it may concern:

Be it known that I, JOHN F. BRADBURY, a citizen of the United States of America, residing at Detroit, in the county of Wayne and btate of Michigan, have invented certain new and useful improvements in Floor- Scrapers, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to a floor scraping machine in which the knife is mounted in a carriage provided with a handle for pushing or pulling it over the floor and my invention consists in the novel construction, arrangement and operation of certain parts, all as more fully hereinafter described and shown in the accompanying drawings, in which Figure 1 is a vertical central, longitudinal section of the device; Fig. 2 a front elevation thereof; Fig. 3 is a detached perspective view of the lever, and Fig. f a view similar to Fig. 1, showing a modified construction of actuating connection.

Referringto the drawings A is a low carriage comprising a frame a preferably made of cast iron to give it weight and of rubber tired wheels 6 upon which it is mounted, the wheels being preferably mounted within the body of the frame. In a vertical slot of the frame is pivotally secured upon a horizontal. axis formed by a fulcrum pin 0 or otherwise the transverse knife head B. This knife head extends above and below its pivotal support, the portion below projects forwardly out in front of the frame and forms a knife seat j to which a suitable knife blade O is adjustably secured in any known man nor, the knife blade being made the full width of the frame. The portion of the knife head projecting above the pivotal support is preferably made to impinge against a suitable abutment which may be the portion (Z of the frame to hold the knife head in its adjusted working position.

Above the knife head is pivotally secured upon a horizontal axis formed by a fulcrum pin 6 the lever D which extends vertlcally above and below the fulcrum. The lower end 2' of this lever enters a vertical slot f in the top of the knife head and forms a knuckle joint therewith. It also has an extension or arm E which projects downwardly in the back of the knife head past the fulcrum pin 0 thereof and is adapted to bear against it.

To the upper end of the lever D which extends above the frame is pivotally secured a connecting bar F, which extends rearwardly in the longitudinal direction of the frame and is pivotally connected to the short arm g of the push lever handle G. This lever is fulcrumed at it directly above the rear wheels projecting upwardly with its short arm and rearwardly with its long arm.

in practice the parts being arranged and constructed as shown and described they are intended to operate as follows: Normally the weight of the long arm of the lever acting through the connections described presses the part it of the lever D against the back of the knife head thereby maintaining the handle in the working position shown in Fig. l, in which position it is at the height convenient for pushing the device over the floor. As the weight of the carriage and knife largely'exceeds that of the handle the knife will be held down and be in position to do the work in pushing the device forward. The tendency of the operator in pushing ahead would be to bear down on the handle more or less and by this downward pressure which is greatly multiplied by the short arm connection, the parts E and 2' will form an interlocking joint with the knife head which firmly locks the knife head in its working position, against any movement around its pivot. However as soon as the operator has come to the end of his forward movement and begins to pull back on the handle which imparts to it a lifting movement, it will through. the connections described turn the knife head upon its pivot.

.sufiicientto lift the knife out of working position and while the carriage is thus being retracted, the knife is held away from the work.

It will be understood that various changes might be made within the scope of my invention and it is also obvious that the stop d may be dispensed with.

My device will scrape the floor the whole width of the carriage and if desired the knife may bemade even of greater width, it will also be seen that owing to the handle being fulcrumed directly over the rear wheels, the carriage can be readily swung around in any direction.

In Fig. 4, I have shown a modified construction of lever connection in which the handle is raised as the machine is pulled along the floor.

I-Iaving thus fully described my invention what I claim is 1. The combination in a floor scraper, of a frame mounted on front and rear wheels, a knife head pivotally supported in the frame and in advance of the front wheel, a knife adjustably secured to the knife head and adapted to be moved from and to the work by rocking the knife head upon its pivot, a lever fulcrumed upon the frame and actuating mechanism between said lever and the knife head, said actuating mechanism adapted to interlock with the knife head in the working position of the knife.

2. The combination in a floor scraper, of a frame mounted on front and rear wheels, a knife head pivotally supported in the frame and in advance of the front wheel, a knife adjustably secured to the knife head and adapted to be moved from and to the work by rocking the knife head upon its pivot, a push lever fulcrumed upon the rear end of the frame and provided with a short arm and actuating mechanism between said lever and the knife head, said actuating mechanism adapted to interlock with the knife head in the working position of the knife.

3. A floor scraper comprising a frame mounted on front and rear wheels, a knife head pivotally supported in the front end of the frame and having a forwardly projecting arm to which the scraper blade is adjustably secured and adapted to move the same in and out of operative position by rocking the knife head upon its pivot, a push lever fulcrumed upon the rear end of the frame and having a long arm projecting rearwardly in position for manipulating the device upon the floor and a short arm having connection with the knife head adapted to interlock the knife head and push lever in the operative movement of the scraper, and to actuate the knife head out of' operative position by raising the push lever.

t. A floor scraper comprising a frame mounted on front and rear wheels, an actuating lever fulcrumed upon the rear end of the frame and having a rearwardly projecting long arm, a knife head transversely pivoted in the front end of the frame and having a forwardly projecting arm carrying a scraper blade adj ustably attached thereto and an upwardly projecting arm notched in its upper end, a lever pivotally secured in the frame above the knife head and having an upwardly projecting arm connected with the actuating lever and two downwardly projecting arms, one engaging with the notch of the knife head and the other extending in rear of the knife head and operating to normally maintain the knife head and actuating lever in their operative position against movement in one direction.

5. A floor scraper comprising a frame mounted on front and rear wheels, a push lever fulcrumed on the frame above the rear wheels and having a rearwardly extending arm for manipulating the scraper, a knife head pivotally supported in the front end of the frame and carrying the scraper blade and actuating connect-ion between the knife head and push lever adapted to normally maintain the push lever and knife head in their operative position and to throw the knife head and knife'out of operative position by raising the push lever out of its normal position.

In testimony whereof I afiiX my signature in presence of two witnesses.

JOHN F. BRADBURY.

itnesses Orro F. BAR'lI-IEL, ANNA M. DORR. 

